252 NORTH AMERICAN FLORA [VoLumE 21 
21. Abronia glaucescens (A. Nelson) Standley, Contr. U. S. Nat. 
Herb. 12: 326. 1909. 
Abronia fragrans glaucescens A. Nelson, Bot. Gaz. 34: 364. 1902. 
Perennial; stems ascending or procumbent, 3-10 dm. long, stout, glaucescent or greenish, 
often tinged with red, glabrous, or sparsely puberulent above, the internodes elongate; petioles 
slender or stout, 1-3.5 cm. long, glabrous or obscurely puberulent; leaf-blades rounded-deltoid, 
ovate-deltoid, ovate-oblong, or lance-oblong, 3-8 cm. long, 1-4.5 em. wide, suwbcordate to 
obtuse at the base, broadly rounded to acute at the apex, glabrous or sparsely and minutely 
puberulent, glaucescent beneath; peduncles slender, 4-18 cm. long, glabrous or puberulent; 
bracts broadly oval or ovate-oval, 11-15 mm. long, 6-9 mm. wide, acute, scarious, white, 
glabrous or nearly so; flowers very numerous, the perianth 2-3 mm. long, viscid-puberulent, 
the tube slender, greenish, the limb 7-8 mm. broad, white; fruit biturbinate, 7-10 mm. long, 
3-5 mm. thick, coriaceous, olivaceous-stramineous, sparsely puberulent, shallowly lobed or 
smooth, the lobes compressed, coarsely reticulate-veined, truncate or usually narrowed above; 
seed obovoid, 2.5-3 mm. long, castaneous, lustrous. 
TYPE LOCALITY: Wyoming. 
DISTRIBUTION: Wyoming and Colorado. 
22. Abronia ammophila Greene, Pittonia 4: 226. 1900. 
Abronia avenaria Rydb. Mem. N. Y. Bot. Gard. 1: 137. 1900. Not A. arenaria Menzies. 1827. 
Abronia Nelsoni Heimerl, Ann. Cons. Jard. Genéve 5: 191. 1901. 
Abronia cheradophila A. Nelson, Bot. Gaz. 34: 364. 1902, 
Perennial; stems stout, sticculent, prostrate, 2-4 dm. long, densely viscid-puberulent, 
much branched, the internodes short; petioles slender, 2—4.5 cm. long, viscid-puberulent; 
leaf-blades oval, elliptic-oblong, or rhombic-ovate, 1-2.5 cm. long, 0.6-1.3 cm. wide, rounded 
to very actite at the base and usually very asymmetric, rounded at the apex, entire, succulent, 
minutely viscid-puberulent; peduncles slender, 3-5 cm. long, viscid-puberulent; bracts elliptic- 
oblong or lance-ovate, 4-5 mm. long, actite, viscid-puberulent; flowers numerous, the perianth 
about 12 mm. long, viscid-puberulent outside, the limb 5 mm. broad, greenish-white; fruit 
biturbinate, 4-6 mm. Iong, viscid-puberulent, coriaceous, deeply 5-lobed, the lobes acute and 
winglike, ohscurely veined, tapering to each end; seed obovoid, 2.5-3 mm. long, brown. 
Tyre Locality: Mouth of Pelican Creek, Yellowstone National Park, Wyoming. 
DISTRIBUTION: Sandy shores, vicinity of the type locality. 
ILLUSTRATION: Contr. U. S. Nat. Herb. 12: f. 65. 
23. Abronia texana Standley, Contr. U. S. Nat. Herb. 12: 323. 
1909. 
Perennial; stems stout, 2-6 dm. long; ascending or procumbent, sparsely branched, 
sparsely short-villous or glabrate, the internodes short or elongate; petioles slender, 1-4 cm. 
long, finely puberulent or glabrate; Ieaf-blades ovate-deltoid, rhombic-ovate, or deltoid, 
2-6.5 em. long, 1.2-4 cm. wide, cordate to rounded at the base, rounded or very obtuse at the 
apex, entire or subsinuate, sparsely puberulent or glabrate; peduncles slender, 4-12 cm. long, 
viscid-puberulent; bracts linear-lanceolate to narrowly oval, 7-10 mm. long, usually 2-3 mm., 
rarely 4 mm., wide, acute to attenuate, scarious, whitish, short-villous or puberulent; flowers 
numerous, the perianth 15-20 mm. long, the tube very slender, viscid-puberulent, greenish, 
the limb 6-8 mm. broad, white; fruit biturbinate, 6-8 mm. long, 3-4 mm. broad, thin, puberu- 
lent, brownish-gray, deeply 5-lobed, or the outer fruits obscurely lobed, the lobes usually com- 
pressed and winglike, narrowed toward each end; seed elliptic-oblong, 2.5 mm. long, dark- 
brown, lustrous. 
Tyre LocaLiry: Estelline, Texas. 
DIstRIBUTION: In sandy soil, northern and western Texas. 
In.ustRation: Contr. U.S. Nat. Herb. 12: pl. 41, f. 2. 
24. Abronia pumila Rydb. Bull. Torrey Club 29: 683. 1902. 
Abronia sparsifolia Standley, Contr. U. S. Nat. Herb. 12: 322. 1909. 
Perennial, from a slender woody root; stems few or numerous, ascending or decumbent, 
1-4 dm. long, stout, whitish, minutely viscid-puberulent or glabrate, sparsely branched, the 
